From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B3B6C433EF for ; Mon, 7 Mar 2022 08:41:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C06148D0003; Mon, 7 Mar 2022 03:41:23 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id BB6168D0001; Mon, 7 Mar 2022 03:41:23 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A7E028D0003; Mon, 7 Mar 2022 03:41:23 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0216.hostedemail.com [216.40.44.216]) by kanga.kvack.org (Postfix) with ESMTP id 957AB8D0001 for ; Mon, 7 Mar 2022 03:41:23 -0500 (EST) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 3EC30A7C2D for ; Mon, 7 Mar 2022 08:41:23 +0000 (UTC) X-FDA: 79216946046.20.B58FA18 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf30.hostedemail.com (Postfix) with ESMTP id ADB1180006 for ; Mon, 7 Mar 2022 08:41:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1646642482; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WZ/jRjm903Qd3wvvBRPNuh4p9MGGDlugM+CNft25NUA=; b=LmoEMjF3cVhbtbF9UEopoJSFahYPWIOpJzN6UUkHJ4FDgNz4COXP8fxJOEkjsbCegTEBVd IDlG/pc3EYSe+8g551td4+8K+P0G8RiB51R8jiyyVvFbneXDsQDo9kBUmAIiQqtAJfIyNN wYxAwdR+yhQSnSBpnh3SAvWKgQIPNRQ= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-225-7QpjBn9HO--5uF--1O_0Uw-1; Mon, 07 Mar 2022 03:41:20 -0500 X-MC-Unique: 7QpjBn9HO--5uF--1O_0Uw-1 Received: by mail-wr1-f69.google.com with SMTP id z1-20020adfec81000000b001f1f7e7ec99so304686wrn.17 for ; Mon, 07 Mar 2022 00:41:20 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:organization:in-reply-to :content-transfer-encoding; bh=WZ/jRjm903Qd3wvvBRPNuh4p9MGGDlugM+CNft25NUA=; b=o/Lp+Anjy/nXZvb170IuiGrkC7xub0m93uqte6badoZF9bQBAnmZCQ6IMm/nqsMrIo CWGWqL/+XVcTR6tDv9C2KVfTcUEjzIIQ1z25/AhDziLCDrBpgCxyZm6T3INkYGMaZx6/ YCjcEnWxNqdKvyDL9PEqPvw1PesBkirG6fHUgegzaa7lmqiAGvD857eDcAmABzt2pmSQ J2rBFRYCKu/ZJeSmDF1DgBK/hsndyjKlFNK2hjvzKomZZ32KfDnQBxzOigY+mqs0c/N4 uPfaY886OwwrS49qSYalm1gKSWcNgsWtQ75t+0e+uHtbuyI99Vk6BPj1tR1dtTQTpSDW WLGg== X-Gm-Message-State: AOAM532kPxJ84nPdH9czEzZYu/ZETH5l2owypzUIZQaNgvb9PFAp3bne j7puysYVlhYKDVHVd+jEGiN6Rtm/GEbuWIKJF3+dwXYt5mpZeZ+bnykhqfYrFNYfz+kooLzB6IJ UM9pCvcwOP6I= X-Received: by 2002:a05:600c:3487:b0:382:aa28:fe1f with SMTP id a7-20020a05600c348700b00382aa28fe1fmr8466869wmq.170.1646642479629; Mon, 07 Mar 2022 00:41:19 -0800 (PST) X-Google-Smtp-Source: ABdhPJzh3j8bOrlKZVeuOO6ZBdw54ZKnMPAH6OWecAGua1WoBrret/+L6m+6T54iTZ88hifVbfDIvQ== X-Received: by 2002:a05:600c:3487:b0:382:aa28:fe1f with SMTP id a7-20020a05600c348700b00382aa28fe1fmr8466859wmq.170.1646642479426; Mon, 07 Mar 2022 00:41:19 -0800 (PST) Received: from ?IPV6:2003:cb:c705:1e00:8d67:f75a:a8ae:dc02? (p200300cbc7051e008d67f75aa8aedc02.dip0.t-ipconnect.de. [2003:cb:c705:1e00:8d67:f75a:a8ae:dc02]) by smtp.gmail.com with ESMTPSA id r20-20020adfa154000000b001f0326a23e1sm10674958wrr.88.2022.03.07.00.41.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 07 Mar 2022 00:41:19 -0800 (PST) Message-ID: <8c73ec79-d580-81a4-b8d4-a06a48a35f7a@redhat.com> Date: Mon, 7 Mar 2022 09:41:18 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH mmotm v2] mm: delete __ClearPageWaiters() To: Hugh Dickins , Andrew Morton Cc: Matthew Wilcox , Nicholas Piggin , Yu Zhao , Yang Shi , Michal Hocko , linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <351df0af-78f2-c20-2a6d-e5f978e5ca1@google.com> <9dda55d5-eafa-3177-2a4c-32ccb7e146e3@google.com> <90aafe84-fe7d-c70e-8e15-c222869f30fc@redhat.com> <6e5262ff-8596-a86-7388-eddb2b2c53c@google.com> <3eafa969-5b1a-accf-88fe-318784c791a@google.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <3eafa969-5b1a-accf-88fe-318784c791a@google.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: ADB1180006 X-Stat-Signature: 6eq4wen8p7m893kfyy7kb7yt6zawb786 Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=LmoEMjF3; spf=none (imf30.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 170.10.129.124) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-HE-Tag: 1646642482-901207 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 04.03.22 22:25, Hugh Dickins wrote: > The PG_waiters bit is not included in PAGE_FLAGS_CHECK_AT_FREE, and > vmscan.c's free_unref_page_list() callers rely on that not to generate > bad_page() alerts. So __page_cache_release(), put_pages_list() and > release_pages() (and presumably copy-and-pasted free_zone_device_page()) > are redundant and misleading to make a special point of clearing it (as > the "__" implies, it could only safely be used on the freeing path). > > Delete __ClearPageWaiters(). Remark on this in one of the "possible" > comments in folio_wake_bit(), and delete the superfluous comments. > > Signed-off-by: Hugh Dickins > Tested-by: Yu Zhao Thanks Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb